Machine-gun



J. F.'0"MALLEY.

MACHINE- GUN.

APPLlcATloN FILED Dsc.11.-191a.

1. F. OMALLEY.

MACHINE GUN.

APPLICATIQN FILED DEC. 11.41918.

Patented Feb. 3, 1920.

2 SHEETS--SHEET 2.

A TTOR/VEYS which similar c JOHN vFRANCIS OMALLEY, 0F MOUNT VERNON, NEWYORK.

MACHINE-GUN.

Specification of Letters Patent.

Patented Feb. A3, 1920.

Application tiled December 11, 1918. Serial No. 266,194.

To all whom t may concern.'

Be it known that I, JOHN FRANCIS OMALLEY, a subject of the King of GreatBritain, having declared my intention to become a citizen of the UnitedvStates, and

a resident of Mount Vernon, in the county of Westchester 'and State ofNew York, have invented a new and Improved Machine-Gun, of which thefollowing is a full, clear, and exact description. l

' The invention relates to machine guns such as shown and described inthe application for Letters Patent of the United States, Serial No.181,024, filed by me on July -17, 1,917.

The object of the present invention is to provide a new and improvedmachine gun arranged to permit the use of interchange- Yable gunbarrels, of which one is water cooled, another is double, reversible andair cooled, and the third is a single air cooled barrel. Another objectis to 'provide a perfect balance in the rotating cartridge wheel and topermit operating the crank shaft from one side of the gun instead offrom underneath, as disclosed in my previous apy plication abovereferred to.

With thse and other objects' in view, the invention consists of certainnovel .features of construction, as hereinafter shown and 'described andthen specifically pointed out inthe claims.

Apractical embodiment of the invention is represented in theaccompanyingdrawings forming a part of this specification, 1n

aracters of reference indicate corresponding parts in all the views.

Figure 1 is a side elevation of the machine gun provided with a watercooled barrel;

Fig. 2 is a plan view of the same;

Fig. 3 is an enlarged cross section of the same on the line 3-3 of Fig.5;

Fig. 4 is a similar view of the same on the line 4 4 of Fig. 5;

Fig. 5 is an enlarged longitudinal central section of themachine gun;

Fig. 6 is a side elevation of the machin gun provided with -reverslbleand water cooled barrels; Y I

F ig. ,7 is a similar view of the machine gun provided with a singleair-cooled bar- I rel: and v Fig. 8 is a side elevation of one of thebarrels shown in Fig. 6. The gun body or main frame 10 'of the machinegun is preferably made in two parts 11 and 12 fastened together bytransverse screws 13, and the said parts 11 and 12 are provided withtransversely extending interlocking tongues and grooves, one fittinginto the other to securely hold the parts against longitudinal movementone on the other, as will be readily understood by reference to Fig. 2.The forward end of the part 12 of the gun body 10 is provided with arecess 20 and with a forwardly extending spindle 21 adapted to supporteither a single water jacketed barrel 22 or two reversible barrels 23,24 (see Fig-6) provided with trans?.

versely extending air cooled ribs 25, 26 for keeping the barrels cooledby the action of the surrounding air. The barrel 23 may be separatelymounted on the spindle 21, as shown in Fig. 7. The barrel 22 is providedwith bearings 30 and 31, of which the rear bearing 30 and the'rear end32 of the barrel t into the recess-20, and the said bearings 30 and 31engage the spindle 21. A screw 33 screws into the part 11 of the gunbody y10 against the bearing 30'to securely hold the barrel-22 inposition on the gun body.

The forward end of the spindle 21 is vprovided with a nut 34 and aspring 35 is coiled on the spindle and interposed between the said nut34 andthe bearing 31. The nut 34 andthe spring 35 can be readily removedwhenever it is desired to interchange the barrel 22 with the otherbarrels 23, 24. The barrel 23 is provided with spaced bearings 40, 41,and a bearing 42 is formed on the barrel 24 and lits between thebearings 40 and 41. The rear end of the bearing 40 is adapted to passinto the recess 20 the same as the bearing 30 and is .adapted to befastened therein by the set screw 33. The bearings 40, 41 and 42 engagethe spindle 21 and the spring 35 is in this case interposed between thebearing 41 and the nut 34, as plainly shown in Fig. 6 and 7. Byreference to Fig. 7 it will be noticed that the barrel 24 can be omittedbut when in conjunction with the barrel 23 its rear end lits into the`recess 20, and when itis desired to reverse the barrels 23 and 24, thatis, to move the barrel 23 out of operativeV position relative to the gunbody and to move the barrel 24 into operative position relative tothesaid gun body, then it is only necessary for the operator to slide thetwo barrels 23 and 24 outwardly until the inner ends of the barrelsdisengage the recess 20 to allow the operator to turn the barrels on thespindle Vat p naled in suitable bearings 68 attached to the 21 until thebarrel 24 is uppermost and the barrel 23 is lowermost. On the operatornow 'releasing the barrels, the spring 35 causes the rear ends of thebarrels to rengage the recess 20.- The barrels are next fastened inplace by screwing up the set screw 33, which is temporarily unscrewedduring the reversing operation as above mentioned.

The gun body 10 is provided with a cartrid e wheel chamber 50 havingopenings 51 e sides for the passage in a.transverse directionof thecartridge belt 52 carrying the cartridges 53 adapted to movesuccessively -into ring position relative to the bore 54 formed in thegun body 10 and in register with the bore of the barrel 22, 23 or 24 inuse at the time, as above explained. Thev cartridge vbelt 52 and thecartridges 53 engage a cartridge wheel 60 arranged within the chamber 50and provided with a shaft 61 journaled insuitable bearings formed in thegun body 10. On the shaft 61 is secured a gear wheel 62 in mesh with agear wheel 63 secured on a longitudinally extending shaft 64 journaledin the gun body 10, as plainly indicated in Fig'. 5. The rear end` ofthe shaft 64 passes out ofthe gun body and passes along the under sidethereof and on this rear end is secured a bevel gear wheel 65 in meshwith a bevel gear wheel 66 secured on a transversely extending shaft 67jourunder side of the gun body 10, as plainly shown in Fig. 3. A crankarm 69 is attached to the right hand side of the shaft 67 to permit theuser of the gun to conveniently turn the shaft 67 with a view to rotatethe shaft p 64 which bythe gear wheels 63, 62 rotates the )shaft 61 andconsequently the cartridge wheel 60 to feed the cartridge belt 52 throuh the chamber 50 for the purpose above escribed.

In order to re the cartridges 53 as they successively move intooperative position in the gun body 10, use is made of Ia firing pin 70sliding in the gun body and attached to the forward end ofa hammer 71pressed in a forward direction by a spring 72 as plainly shown in Fig.5. The hammer 71 is provided at its forward end with a tooth 73 engagedsuccessively by teeth 74 of a cam wheel 75 rotating with' the cartridgewheel 60. Thus when the cartridge wheel is turned, the cam wheel 75pushes the hammer 71 rearwardly against; the tension of the spring 72,and then the cam wheel releases the hammer 71 and allows the same to mveforward by the action of its spring 72 to re the cartridges 53 movedinto operative position during the turning ofv the cartrid e wheel 60.This mechanism is practically the same as the one described in theapplication above referred to so that further detailed description ofthe same is not deemed necessary. The forward end of the gun (see Figs.1 and 4),

4'and another of the said barrels vided with a water jacket for thecircu ation vbody 10 is attached to the rear end 80 of a lever 81 by theuse of a transverse pin 82 and the said lever 81 is' pivoted at 82 on apost 83 having a depending pivot 84 journaled in a support 85 preferablyin the form of a tripod having legs 86. VThe rear end of the lever 81 ispivotall connected with a screw rod 90 on Whic screws a nut 91 mountedto turn in a bearing 92 forming part of the post 83. By turning the nut91, the screw rod 90 is moved u 0r down according to the direction in wich the nut is turned, and this movement -ven to the screw rod 90 causesan up or own swinging movement of the lever 81 to elevate or depress thegun body and with it the barrel mounted thereon. It will be noticed thatby the arrangement described the gun body and its barrel can be minutelyadjusted to insure accurate shooting andthe gun body and its barrel maybe readily swung to one side or the other according to the direction inwhich the shot is to be fired.

The gun body l0 and the barrels are provided with suitable rear andfront sights 100 and 101 of any approved construction.

Having thus described my invention, I claim as new anddesire to secureby Letters Patent .1. In a. machine gun, a gun body provided at itsforward end with a recess, a Spindle extending forwardly from the saidrecessed end of the gun body, and a plurality of barrels arranged forinterchangeable engagement with the said spindle and the said recess tohold the gun barrel in operative relation to the gun body, the saidbarrels havin means for cooling the same, one of the sai barrels havingvmeans for coolinv itby-air ein proof'water to cool the barrel. l

2. In a machine gun, la gun body provided at its forward end with arecess and 4with a 'forwardly extending spindle, a barrel having spacedbearin s engaging the said spindle,and a `secon barrel having a bearinfitting between the said spaced bearings `and engaging the saidspindle,the rearrends of 115 the said barrels'engaging the vsaid recess.

.3. In a machine gun, a gun body provided at'its' forward end with arecess and with a forwardly extending spindle, a barrel having spacedbearings engaging the said spindle, a barrel having a bearmg fittingbetween the said-spaced bearings and engaging the said spindle, the rearends of the said bar- -rels engaging the said recess, a cap on'theforward end of the said spindle. and a sprin coiled on the said spindle.and arrange intermediate the said cap and the forward one' of the saidbearings.

4. In a machine'gun, a gun body provided at its forward end with arecess and with a forwardly extending spindle, a barrel having spacedbearings engaging the said spindie, a second barrel having a bearingfitting between the said spaced bearings and engaging the said spindle,the rear ends of the said barrels engaging the said recess, a cap on theforward end of the said spindle, a spring` coiled on the said spindleand arranged intermediate the said cap andI the

